Installation used for rolled metal cooling

FIELD: rolling-mill machinery.

SUBSTANCE: the invention presents an installation for rolled metal cooling and is dealt with metal rolling, in particular with cooling of rolled metal. The installation for rolled metal cooling contains a body with an inlet branch-pipe and two rows of outlet branch-pipes displaced from each other by a half step. Value of a step of the outlet branch pipes in each row does not exceed four internal diameters of the branch-pipes. Across the body opposite to an entry of the inlet branch-pipe a dissector is installed. Along the body opposite to the outlet branch-pipes there are two entire central plates and two fragmentary lateral plates forming two longitudinal funnel-shaped cavities, turned by their narrow parts to each row of outlet branch-pipes. Fragmentariness of the lateral plates is created at the expense at least of one cutout in the base of each plate, at the longitudinal butts of which there are two perpendicularly fixed damping plates facing inside the funnel-shaped cavities. The invention allows to increase evenness, flexibility and efficiency of the rolling metal cooling process and ensures reliable operation of the installation.

EFFECT: the invention allows to increase evenness, flexibility and efficiency of the rolling metal cooling process and ensures reliable operation of the installation.

4 silt

 

The invention relates to a device for cooling rolled and can be used for rapid cooling of the products of hot rolling mills.

A device for cooling strip on top of the delivery table broadband mill, consisting of filling tanks installed above the discharge roller, placed in them rounded U-shaped cylindrical nozzles to the expiration of the cooler on the strip (see USSR author's certificate No. 406587, 21 In 45/02, 1973).

The known device has several disadvantages. When unilateral supply of water in the water tank, and such a scheme is the most cheap and most common, longitudinal velocity of water along the length of the tank varies from a maximum at the inlet to zero from the deaf opposite end of the tank. In accordance with a change in velocity along the length of the tank, unevenly distributed, and the water pressure: minimum inlet into the tank and the maximum at the back end. For this reason, the flow of water through cylindrical pipes, distributing the flow along the length of the tank, also uneven, resulting in uneven cooling across the width of the strip.

In addition to the main longitudinal velocity, the flow of water entering into the tank, has a chaotic transverse components of speed, causing local turbulence and uneven MSE of the spines in the flow cross section. Such turbulence is associated with the intensity of changes in flow size and flow directions. When the jets this restlessness of the flow from the cylindrical U-shaped nozzles in the atmosphere is partially disintegrating into individual drops, reduces the impact force of the water on the strip, which drastically reduces the cooling efficiency.

Free jet of water emerging from the cylindrical nozzle, under the force of gravity accelerates and as the distance from the point of discharge from the nozzles, in accordance with the increase in the rate of fall of water due to surface tension forces of cylindrical jets is compressed, the cross section of the jet decreases. With increasing compression of the jet increases the transverse components and the uneven distribution over the cross section of the longitudinal velocity of the jet. When the ratio of the jet (the ratio of the transverse area of the compressed stream to the sectional area of pipe) is less than 0,6 cutting forces due to the nonuniformity of velocity exceeds the surface tension of the jet, resulting in a broken continuity, there is a disintegration of the jet into droplets, followed by thickening the already two-phase (air-water) “quasithree” (see, for example, Altshul ROAD and other “Hydraulics and aerodynamics” - M.: stroiizdat, 1987. - 414 C.). In addition to the drop height, the ratio of the jet depends on ve is icine initial velocity of water discharge from the nozzle (see 1). More than the initial flow rate, the greater the compression ratio of the jet (less probability of disintegration of the jet into droplets). When the water inlet in the cylindrical pipe of the water tank there is a significant pressure drop: flow is split into many threads with sharp changes of direction and sudden contraction. These pressure losses in the device does not allow to obtain the value of the initial rate of water discharge from nozzles sufficient to maintain the continuity of the jet when they hit the runway.

The most intensive cooling of the strip (see Labels VG “Liquid cooling of high-temperature metal - Leningrad: Izd-vo LGU, 1983, 172 C.) occurs on the Playground with a diameter of 2-5 times larger jet diameter at the point of impact of it on the surface of the strip, where the implemented mode unstable film boiling, constantly interrupted flow speed of the water, providing a contact cooler with metal. On the periphery of the site, on the surface of the strip forms a stable vapor film which separates the metal and flowing cooling water. The intensity of the cooling strips on these sites is low. While maintaining the continuity of the jet at the moment of impact on the band is a smooth transition of the vertical core flow in a horizontal radial without splashing and churning. Form is the lasting when water contact with hot metal steam the shirt falls not only on the spot vertical jet impact but on the site, up to 5 diameters of the jet due to the high-speed horizontal radial flow along the strip. The integrity of the horizontal flow is supported by surface tension of water. If continuity when the drop is missing, and vertical flow “quasithree” scattered into many drops, then when they hit the strip drops behave like elastic body: jump after the shock of contact over stripe (razbrasivayutsya) and spread a low-speed radial horizontal flow along the strip. This failure of steam “shirts” and intense cooling occurs only at the site of direct vertical impact of the water jet on the runway, after spraying a layer of water moves horizontally on sustainable steam “shirt”, do not allow him contact with the metal and intensive cooling.

A device for cooling rolled, containing casing with a slit nozzle placed inside the casing, a pipe with a longitudinal slot, and installed inside the pipe sleeve with pipes. Moreover, the total area of the internal cross sections of the nozzles in the 1.6-2.3 times less than the internal cross-section area of the liner and not less than 0.8 square internal cross-section of a slotted nozzle (see USSR author's certificate No. 954442, 21 D 1/02, 1982).

The disadvantage of this device is very narrow on Amazon optimal water flow, which maintains the required continuous uniform “water veil”. This is due to the low surface tension of the thread flat “veil”, which is determined by the radius of the surface flow: the smaller the radius of the curved surface of the flow, the greater the surface tension of the liquid, which does not allow to fall down the stream into separate drops. The radius of a plane jet in a large faces “veil” tends to infinity, and the value of the surface tension is zero, i.e. forces seeking to preserve the integrity of the thread, no. In addition, at high speed on the exit slit saved transverse components of velocity from the rotational motion of the flow in a spiral in the housing, which contributes to the turbulence of the flow. For these reasons, when the water flow above a narrow optimal range “water veil” falls apart in thickness on a separate drip jet is disrupted continuity and laminarinase” thread, distorted its shape in the longitudinal and transverse directions. This leads to a splash when hitting a vertical flow of the strip and the formation of thickened low-velocity horizontal water layer, moving on sustainable steam “pillow”, separating the water from the metal, which dramatically reduces the efficiency of cooling of the strip. When the water flow rate is below the optimal range is on narrowing the flat jet on areas with discontinuities along its length, what causes uneven cooling across the width of the strip. For example, in the accelerated cooling system bandwidth broadband mill, depending on number of enabled cooling sections, the consumption of each device can be changed 2-3 times and lead to inefficient scattered turbulent flow and water walls with gaps across the strip width. Also a disadvantage of this device is the requirement for high precision in the manufacture of parallelism dekoven slit. In violation of the parallelism of the slit or local clogged there is a break in the continuity of the water walls and uneven cooling across the width of the strip. In addition, a large hydraulic resistance of the narrow ends of the sleeve leads to a large drop in water pressure when passing through them, which reduces the velocity head at the exit slit, and hence the discontinuity of the lower section of the water wall and reduce the efficiency of cooling of the strip. Whereby during operation the flow area of the nozzles is reduced due to salt deposits and impurities, which increases the hydraulic resistance of the pipe and further reduces the efficiency and uniformity of cooling. Staff access to the nozzles located inside the unit for cleaning difficult. Likely fully what about the clogging of narrow nozzles of solid particles always present in the cooling water, and to the integrity of the device, which reduces the reliability of the device.

In the present device solves the problem of increasing the uniformity and efficiency of cooling of flat rolled products, as well as the reliability of the device. This problem is solved due to the fact that the device for cooling rolled, comprising a housing with inlet and two rows of outlet nozzles that are offset relative to each other by half a step, the step size of outlet nozzles in each row does not exceed four inner diameters of the nozzles across the body in front of the entrance of the inlet tube installed divider and along the body opposite the outlet nozzles of the two solid Central and two spaced side plates forming two longitudinal funnel-shaped cavity facing the narrow part of each row of outlet nozzles, and the adhesion of the side plates is created by at least one cutout in the base of each plate. In addition, the longitudinal ends of the notches of the side plates perpendicular to the two fixed extinguishing plate facing the inside of the funnel-shaped cavities.

Figure 2. shows the isometric image of the device in partial longitudinal section; figure 3 is transverse and longitudinal sections; figure 4 - isometric is some images of the inner parts of the device.

The proposed device for cooling the rent consists of a housing 1 with end flanges 2, 3, inlet 4, the divider 5, the Central plate 6, spaced side plates 7 with cut-outs 8, absorbing plate 9, two rows of outlet nozzles 10.

The device operates as follows.

Through the supply pipe 4, the coolant flows into the housing 1, where the divider 5 is smoothly divided into two separate longitudinal flow (see figure 3). The velocity distribution along the length of the housing in these flows unevenly: the maximum velocity at the inlet of the divider and the minimum blank flange 3. According to the laws of hydraulics, the pressure distribution of the fluid along the length of the housing in both flows unevenly, and opposite to the velocity distribution. Due to the presence at the base of each of the side plates 7 cut 8 (at least one) both flow change direction from longitudinal to transverse and consists of two funnel-shaped cavity between the Central plate 6 and the side plates 7 with pressure-dependent values bore cut and locations of cutouts along the length of the side plates. The closer the cut is to a deaf flange 3, the higher the pressure of the coolant at the entrance to the funnel-shaped cavity. The pressure distribution flows along the length of the funnel-shaped cavities maintains what is the constructive arrangement of the cutouts and the values of their passage sections along the length of the plates. By varying these parameters, one can obtain a wide range of plots of the pressure distribution in a funnel-shaped cavity length of the device: from concave to convex plot of the pressure distribution. This allows you to configure the device for various schemes cooling of the strip along its width, in the particular case, when the Central-symmetric arrangement of cut is achieved a uniform pressure distribution and uniform cooling.

The fluid flow in each of the funnel-shaped cavity rises in the vertical direction from the lower generatrix of the body to the top. During this movement, the flow settles down in the longitudinal direction of the restraining plates 9, smoothly straightened and compressed in the transverse direction Central 6 and the side plates 7 to the internal diameter d of the outlet pipe 10, thus minimizing hydraulic losses in compression flow at the entrance of his coming in the pipes. As you progress through the exit nozzle flow smoothly turns on a curved section, and then stabilized on the long straight, so that at the exit of the nozzle jet of fluid had the highest rate with a minimum of turbulence. The main reasons for that is the low hydraulic flow losses inside the device due to the lack of local hydraulic resistance is the flow path from inlet to outlet pipes. As a result, most of the surviving piezometric head flow (pressure) at the outlet of the nozzle 10 into the atmosphere enters the maximum kinematic pressure (speed) jet without significant turbulence and transverse velocities. The jets at the exit of the nozzle device is no significant spillage into droplets. Due to the fact that the initial velocity of the outflow stream from the nozzles maximum compression of the jets in free fall to strip insignificant, that it does not lead to disintegration of jets (see figure 1). Thus, each stream falls on the continuous strip of core flow, which after the forceful contact with the ground without spilling smoothly into the radial speed horizontal flow. The zone of intensive cooling of the strip not less than the circumference of size 2×d, where d is the inner diameter of the nozzle (jet). On a plot size of T between two adjacent nozzles of one row are guaranteed to intensively cooled band in the two edge zones of the value for d of this section (smfg). In the proposed design of the cooling unit distance between adjacent nozzles (T) one number does not exceed four diameters of the pipes (4×d), i.e. jets from nozzles of this number may not be cooled intensively average zone size 2×d strip section between the pipes But as a single row of nozzles of the device are offset from the nozzles of the second row in the transverse direction by a half pitch of the nozzles (T/2), the average area is intensively cooled by the jet nozzles of the other row with a minimum size of zone 2×d. Thus, the entire area between the nozzles, and hence all the bandwidth guaranteed intensively cooled by jets of the device.

Inside the device there are no nodes with small reduced cross-section, are prone to clogging by sediment cooling water. Therefore, the reliability of the device is quite high.

The proposed cooling device enables you to evenly cool car with a high efficiency chiller and reliability of the equipment.

The cooling device of the Bicycle, comprising a housing with inlet and two rows of outlet nozzles that are offset relative to each other by a half pitch, characterized in that the step size of outlet nozzles in each row does not exceed four inner diameters of the nozzles across the body in front of the entrance of the inlet tube installed divider and along the body opposite the outlet nozzles of the two solid Central and two spaced side plates forming two longitudinal funnel-shaped cavity facing the narrow part of each row of the output is the yaschih nozzles, moreover, the adhesion of the side plates created by at least one cutout in the base of each plate, on the longitudinal sides of which are perpendicular to the two fixed extinguishing plate facing the inside of the funnel-shaped cavities.



 

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